Highly Emissive 9-Borafluorene Derivatives: Synthesis,Photophysical Properties and Device Fabrication |
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| Authors: | Xing Chen Dr. Guoyun Meng Guanming Liao Dr. Florian Rauch Dr. Jiang He Dr. Alexandra Friedrich Prof. Dr. Todd B. Marder Dr. Nan Wang Dr. Pangkuan Chen Prof. Dr. Suning Wang Dr. Xiaodong Yin |
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| Affiliation: | 1. Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 102488 Beijing, P.R. China;2. Institut für Anorganische Chemie, Institute for Sustainable Chemistry & Catalysis with Boron (ICB), Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany;3. Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/Electrophotonic, Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 102488 Beijing, P.R. China Department of Chemistry, Queen's University, Kingston, ON, K7L3N6 Canada |
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| Abstract: | A series of 9-borafluorene derivatives, functionalised with electron-donating groups, have been prepared. Some of these 9-borafluorene compounds exhibit strong yellowish emission in solution and in the solid state with relatively high quantum yields (up to 73.6 % for FMesB-Cz as a neat film). The results suggest that the highly twisted donor groups suppress charge transfer, but the intrinsic photophysical properties of the 9-borafluorene systems remain. The new compounds showed enhanced stability towards the atmosphere, and exhibited excellent thermal stability, revealing their potential for application in materials science. Organic light-emitting diode (OLED) devices were fabricated with two of the highly emissive compounds, and they exhibited strong yellow-greenish electroluminescence, with a maximum luminance intensity of >22 000 cd m−2. These are the first two examples of 9-borafluorene derivatives being used as light-emitting materials in OLED devices, and they have enabled us to achieve a balance between maintaining their intrinsic properties while improving their stability. |
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| Keywords: | boron heterocycles density functional calculations luminescence organic light-emitting diodes photophysics |
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